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Start toward actually writing out tiles

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This commit is contained in:
Eric Fischer 2014-09-22 15:41:13 -07:00
parent 41981ec8e9
commit b8e7d3edf8
2 changed files with 61 additions and 2 deletions
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4
Makefile
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@ -14,7 +14,7 @@ PG=
jsoncat: jsoncat.o jsonpull.o
cc $(PG) -g -Wall -o $@ $^
geojson: geojson.o jsonpull.o vector_tile.pb.o
geojson: geojson.o jsonpull.o vector_tile.pb.o tile.o
cc $(PG) -O3 -g -Wall -o $@ $^ -lm -lz -lprotobuf-lite
jsoncat.o jsonpull.o: jsonpull.h
@ -27,4 +27,4 @@ libjsonpull.a: jsonpull.o
cc $(PG) -O3 -g -Wall -c $<
%.o: %.cc
g++ -g -Wall -O3 -c $<
g++ $(PG) -O3 -g -Wall -c $<

59
tile.cc Normal file
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@ -0,0 +1,59 @@
#include <iostream>
#include <fstream>
#include <string>
#include <zlib.h>
#include "vector_tile.pb.h"
#define XMAX 4096
#define YMAX 4096
// https://github.com/mapbox/mapnik-vector-tile/blob/master/src/vector_tile_compression.hpp
static inline int compress(std::string const& input, std::string& output) {
z_stream deflate_s;
deflate_s.zalloc = Z_NULL;
deflate_s.zfree = Z_NULL;
deflate_s.opaque = Z_NULL;
deflate_s.avail_in = 0;
deflate_s.next_in = Z_NULL;
deflateInit(&deflate_s, Z_DEFAULT_COMPRESSION);
deflate_s.next_in = (Bytef *)input.data();
deflate_s.avail_in = input.size();
size_t length = 0;
do {
size_t increase = input.size() / 2 + 1024;
output.resize(length + increase);
deflate_s.avail_out = increase;
deflate_s.next_out = (Bytef *)(output.data() + length);
int ret = deflate(&deflate_s, Z_FINISH);
if (ret != Z_STREAM_END && ret != Z_OK && ret != Z_BUF_ERROR) {
return -1;
}
length += (increase - deflate_s.avail_out);
} while (deflate_s.avail_out == 0);
deflateEnd(&deflate_s);
output.resize(length);
return 0;
}
void write_tile(char *name) {
GOOGLE_PROTOBUF_VERIFY_VERSION;
mapnik::vector::tile tile;
mapnik::vector::tile_layer *layer = tile.add_layers();
layer->set_name("name");
layer->set_version(1);
layer->set_extent(XMAX);
std::string s;
std::string compressed;
tile.SerializeToString(&s);
compress(s, compressed);
std::cout << compressed;
}